Dentist s or photographer s chair



(NoModel.) 2 Sheets--Sheet 1.`

O. C. WHITE. DBNTISTS 0R PHOTOGRAPHERS CHAIR.

No. 326,185. l y Patented Sept. 15, 1885..

om c. ma?,

al@ y (No Model.) 2 Sheets-Sheet 2.

O. C. WHITE.

DENTISTS 0R PHOTOGRAPHERS CHAIR. No. 826,185. l Patented Sept. l5, 1885.

UNITED STATES PATENT OFFICE.

OTIS CONVERSE WHITE, OF WORCESTER, MASSACHUSETTS.

DENTISTS OR PHOTOGRAPHERS CHAIR.

SPECIFICATION forming part of Letters -Patent No. 326,185, datedSeptember 15, 1885.

Application filed April 20, 1895. (No model.)

To all whom, it may concern:

Be it known that I, Oris CONVERSE WHITE, of the city and county ofWorcester, in the Commonwealth of Massachusetts, have invented a new anduseful Improvement in Chairs for the use of Dentists or Photographers orothers; and I do hereby declare the saine to be described in thefollowing specification, and represented in the accompanying drawings,ot' which- Figure lis a front elevation, Fig. 2 a side View, and Fig. 3a vertical section, of a chair embodying my invention, the nature ofwhich is defined in the claims hereinafter presented. Fig. 4 is ahorizontal section of one of the arms. Fig. 5 is aside view of one ofthe elbow or forearm rests of the arms. Fig. 6 is atop view of theball-clamp C and the junctionpiece B hereinafter described. Fig. 7 is anunder side View of the socketed cap 7c, applied to the part d and thenut i. Fig. 8 is a front view, Fig. 9 a horizontal section, and Fig. 10an end view,of the ball-clamp E. Fig. ll is a top view of one of thearms H, to be described. Fig. ]2 is a rear view, and Fig. 13 an edgeview, ofthe head-rest clamp.

In such drawings, the seat A without the legs of a chair is represented,as the mechanism shown is, by means of itsjunction-piece B, secured tothe said seat. The said junctionpiece has a flat base, a, that restsupon and is secured to the chairseat by screws. At its upper part the junction-piece is provided with a dovetailed tenon, b, to enter acorrespondingly-shaped socket in a ball-clamp, C, down through and abovewhose ball c there extends a cylindrical rod, D. The said ball c, madein three segments of a sphere bored axially to receive the rod D, isplaced within a spherical socket formed in the two portions d e of thebody of the clamp. The lower portion, e, is movable upward and downwardrelatively to the upper portion, d, the two near their inner ends beingconnected by headed screws ff, that go down loosely through holes in theupper portion and screw into the lower portion.

Between lthe portions d and e, near their outer ends, is a handle, g,that extends from the middle of a short rod, h, which, above the handleas well as below it, is screw-threaded, one screw being a right and theother a left threaded screw. One of these screws has screwed on it ahexagonal nut, i, which is held in place in the part e by a cap, lc,fastened by screws to thesaid part e,and having ahexagonal or polygonalsocket or recess to receive within it the nut and prevent it fromrevolving in the part e. By having the nut revoluble on the screw, whenthe cap is disconnected from such nut and the part c the latter can beadjusted to its proper distance from the part d for the handle, whenbeing moved so as to simultaneously revolve the two screws,to cause theparts d ande to clamp the ball between them and contract it upon the rodgoing down through it.

Above the j unctionpiece B is another ba'llclamp, E, which is clamped onthe rod D, and is movable transversely thereon and lengthwise thereof.Through the ball ot the clamp a rod, F, extends, and has a back-rest, G,fixed to itat its front end by a ball-and-socket connection. The ball,like that shown in Fig. 6, is formed in three spherical pieces, so as tobe capable of being compressed against the rod passing through it. Theclamp l of the ball, pivoted to the socket-piece m, has a screw, a,extending from it through the said piece m, a nut, o, being screwed uponthe screw and against the piece m, which is a dish or convex platesecured to the back-rest. By having the back-rest connected with itssustaining-rod by a ball-and-socket connection provided'with means ofclamping the ball, as occasion may require, from turning within thesocket, and by having such sustaining-rod connected to the rod D by theball-clamp E, the rod going through the ball thereof, the back-rest canbe adjusted in any desirable position tol support the back of a sitterin the chair; or such backrest can be advanced or retracted and movedand tipped laterally as circumstances may require. The ball-clamp E hasmeans of clamping it to the rod D-that is to say, it has hinged to it ajaw, q, to which a screw, i", is pivoted-so as toI enable the screw tobe turned into or out of the notch in the stationary jaw o" of theclamp. A nut, s, screwed on the screw, serves to draw the movable jaw ofthe clamp toward the iixed jaw and the two against the rod between andencompassed by them.

Above the back-rest there are 'clamped to IOO the rod D two arms, H, oneof which -is directly above the other. At its inner end each arm isfurnished with clamping devices for securing it to the rod D andpermitting it to be either turned laterally or moved upward and downwardtherein asoccasion may require. The clamping device at the inner end ofthe arm consists or' amovable jaw, t, hinged to a xed jaw, u, to whichis hinged a screw, e, to extend through a notch in the movable jaw, anut, w, heilig screwed on the screw and against the movablejaw, and bothjaws being suitably recessed to receive the rod between them. i

The arm, by means of its clamping` devices, byl which it is secured tothe rod D, can be removed laterally from or applied to the rod withoutthe necessity ot passing the red upward or downward through the arm. Atits other end each arm is hooked to embrace the pivot :c of one of twoelbow or forearm rests I, such pivot being extended down within acylindrical bearing, y, in the hook. Through the prong or free part ofthe hook a clamp-screw, e, projects and screws into the arm. By turningup the screw the pivot x can be clamped to the arm; or on the screwbeing loosened or turned back the elbow or forearm rest can be turnedaround in the sector of a circle or be removed from the arm. j At thehead of the rod D is another ballclamp, K, sul'lstantially like theball-clamp C hereinbefore described. Through the ball a of the clamp K,such ball being in three segments or parts, a rod, L, extends. Such rodcan be slid lengthwise in the ball, and such rod at its front end haspivoted to it a headrest, M, which is furnished with a clamp-j aw, b',and screw 0', for clamping it to the rod, and admitting of it, the saidrest, being adjusted into different inclinations, as occasion mayrequire. From the above it will be seen that not onlyT can the head-restbe so adjusted, but that it can be moved laterally or up and down, orforward and backward, as the necessitiesof a sitter may demand.

In.the clamp-jaw b', lengthwise thereof, is aslot, d', through which therod L extends and screws into a cylinder, c', that goes through acylindrical bearing, f', in the headrest clamp. On setting up the screwof the clamp the jaw b will be borne against the cylinder, and when thescrew is lowered or turned backward the jaw will spring away from the.cylinder.

When a person may be sitting iu the seat of the chair, the rod D may beadjusted into an upright and an inclined position. The back-rest and thearms and their elbow-rests and the head-rest can also be adjusted intosuitable positions, as may be required fox` them to sustain the personto the best advantage for his com fort and for a dentist to operate onhim. v

The chair can also be used byphotograpliers-or others to` advantage. Itsparts can be readily adjusted to support a sitter either in an uprightor au inclined or reeumbent position.

There extends upward from the top of the junction-piece B a cylindricalrod or post, p', to which, instead of to the rod D, the two arms H maybe applied when itniay be desirable to support them independently of-thesaid rod D. The back-rest can also be adapted to the post as to the rodD.

I claim- 1. The ball-clamp C, substantially as de- 7scribed, composed ofthe two parts d and e,

socketed to receive between them the ball, the screw nut and itssustaining cap applied to one of such parts, and the handle providedwith `the screw to engage with the part d, and the said rest, all beingessentially as set forth. j y y 2. The combination of the head-restclamp, having its jaw b, provided with the slot d', with the cylindere', going through the said clamp and connected at its middle to the rodL by being screwed thereon, all being substantially as set forth,

oTIs ooNvaRsn WHITE.

Vitnesses:

R. H. EDDY, ERNEST B. PRATT.

